package cs4280.ass2.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.log4j.Logger;

public class LogoutFilter implements Filter {
	private static final Logger logger = Logger.getLogger(LogoutFilter.class);

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {

	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
	ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpSession session = req.getSession(false);

		if (session != null) {
			logger.info("user ["+session.getAttribute("loggedInUser")+"] logged out.");
			session.invalidate();
		}
		chain.doFilter(request, response);
	}

	@Override
	public void destroy() {
	}

}
